These are the six known levels of environmental classification.
An organism is any living thing.
Definition: All the individuals of one species in a given area.
Definition: A group of interdependent plants and animals inhabiting the same region and interacting with each other through food and other relationships.
Definition: A system formed by the interaction of a community of organisms with their environment.
Definition: A biome is a complex biotic community characterized by distinctive plant and animal species and maintained under the climatic conditions of the region.
Definition: The part of the Earth's surface and atmosphere inhabited by living things.
Trophic levels are the feeding position in a food chain.
Tertiary consumers are eaten by quaternary consumers.
A secondary consumer is a consumer that gets its energy from other consumers.
A primary consumer is an organism that gets its energy from producers (plants/autotrophs). It is the first heterotroph on a food chain.
Producers are green plants that are capable of making their own food using energy from the sun (photosynthesis)
A biome is a regional ecosystem characterized by distinct types of vegetation, animals, and microbes that have developed under specific soil and climatic conditions.
A factor of or characterized by the absence life or living organisms.
Of or relating to living things.
Biodiversity is the variation of life forms in a given ecosystem, biome, or even an entire planet.
Biodiversity hot spots are places on the Earth that are concentrated with large species of animals. There are 17 around the world. They are generally found in the tropics and only cover about 2% of the Earth.
Ecological succession is a process in which the communities of an ecosystem change over time.
Primary succession occurs in places where an ecosystem never existed.
Secondary succession is a process that begins in an ecosystem when something has disturbed or destroyed the natural community.
Pioneer species are found in the first stage of succession. They are hearty, smaller, grow quickly, and when they die they add nutrients to the rock to make soil.
Climax communities are a stable group of plants and animals that is the end result of the succession process.
Limiting factors are conditions of the environment that limit the growth of a species. Another way you could look at it is the biotic and abiotic factors that prevent the continuous growth of a population.
Carrying capacity is the number of individuals of a species that an ecosystem can support.
Population growth is the increase or decrase in people of a certain area.
Exponential population growth leads to the exponential requirements for resources, energy, food, housing and land as well as the exponential increase in waste by-products.
Logistic Growth: The initial stage of this growth is approximately exponential; then, the growth will slow, and eventually the growth stops.
Population growth rate is the constant rate at which a population changes over time in a certain area.
The Black Plague was a devastating epidemic in human history that caused a dramatic decrease in the world's population.
The Industrial Revolution was a time period in history where there were many advancements in technology, agriculture, and medicines. Because of these great advancements, the human population could survive better.
Sustainablility for humans is the potential for long-term maintenance of well being, which has environmental, economic, and social dimensions.
The addition of harmful chemicals to natural water. Sources of water pollution in the United States include industrial waste, run-off from fields treated with chemical fertilizers, and run-off from areas that have been mined.
Point source pollution is a single identifiable localized source of air, water, thermal, noise or light pollution.
Non point source solution is water pollution affecting a water body from diffuse sources, such as polluted runoff from agricultural areas draining into a river, or wind-borne debris blowing out to sea. Non point source pollution can be contrasted with point source pollution, where discharges occur to a body of water at a single location, such as discharges from a chemical factory, urban runoff from a roadway storm drain, or from ships at sea.